Grinding machine



Aug. 22, 1939. c. G. FLYGARE 2,170,606

GRINDING MACHINE Filed Feb. 10, 1939 2 Sheets-Sheet 2 Patented Aug. 22, 1939 2,170,,ttt

PATENT OFFICE GRINDING MACHINE Carl G. Flygare, Worcester, Mass, assignor t Norton Company, Worcester, Mass., a corporation of Massachusetts Application February 10, 1939, Serial No. 255,665

4 Claims.

The invention relates to grinding machines, and more particularly to a head and footstock positioning or traversing mechanism for a large massive roll grinding machine.

One object of the invention is to provide a simple thoroughly practical mechanism for positioning or adjusting a head and footstock longitudinally relative to its supporting table. It is a further object of the invention to provide a head and footstock positioning mechanism in which the traversing movement of the table is utilized to position the head and footstock longitudinally relative to the table. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements and arrangements of parts, as will be exemplified in the structure to'be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a front elevation of a roll grinding machine embodying this invention;

Fig. 2 is a right-hand end elevation, having parts of the base broken away to more clearly show the internal mechanisms of the machine;

Fig. 3 is a fragmentary front elevation, on an enlarged scale, of the table traversing mechanism;

Fig. 4 is a fragmentary detail view of one of the head and footstock positioning devices; and

Fig. 5 is an end view of the positioning device shown in Fig. 4.

A large massive roll grinding machine, such as used for grinding large heavy rolling mill rolls, has been illustrated in the drawings comprising a base it] having a longitudinally reciprocable work supporting table ll supported thereon on the usual flat way I2 and V-way I3 which mate with flat way 84 and V-way i 5 formed on the under side of the table II. The work table I I is arranged to rotatably support a roll to be ground on a motor driven headstock 2| and a footstock 22. The headstock 2| is provided with a headstock center 23 and the footstock 22 is provided with a footstock center 24. The headstock 25, as illustrated, is preferably a motor driven headstock having an electric motor 25 mounted on the upper surface of the headstock. The motor 25 drives by means of a V-belt driving mechanism (no-t shown) contained within a belt guard 23 to rotate the work driving member. A pair of driving pins 2'! are mounted on a rotatable face plate 28 and serve to engage a work driving dog to rotate the work piece during a grinding operation.

A rotatable grinding wheel 30 is supported on a wheel spindle 3| which in turn is rotatably 5 supported on a transversely movable wheel slide 32. The grinding wheel 30 and the wheel spindle 3! are driven by means of an electric motor 33 mounted on the upper surface of the wheel slide 32. The motor 33 is provided with a driving pulley 34 which is connected by means of a multiple V-belt35 with a pulley 36 mounted on the outer end of the wheel spindle 3|.

The wheel slide 32 is arranged to be moved transversely relative to the base ID, on the usual flat and V-ways (not shown), by a feeding mechanism comprising a half nut 38 depending from the under side of the Wheel slide 32 which mates or meshes with a rotatable cross feed screw 33. The feed screw 39 is rotatably journalled in bearings (not shown) in the base Ill. The front end of the feed screw 39 is provided with a gear 40 which meshes with a gear 4| mounted on the inner end of a rotatable shaft 32 which is journalled in bearings (not shown) in the base it of the machine. The front end of the shaft 12 carries a gear 43 meshing with a rotatable gear (not shown) which is supported on a shaft 44. A manually operable feed wheel 45 which is also supported on the shaft 44 is fixedly connected to rotate the gear. By rotation of the feed wheel 45, the cross feed screw 39 may be rotated to cause the grinding wheel 3i! and its supporting slide 32 to move either toward or from the roll 23 being ground.

The grinding wheel 30 and the work supporting table II are arranged so that they may be reciprocated longitudinally relative to each other to produce the desired grinding action upon the roll 20 being ground. In the preferred construction, the table I! is reciprocated by means of a rack bar 59 which is mounted on the under side of the base I. A gear 5| meshes With the rack which is arranged to be driven by a power driven mechanism such, for example, as that shown in the prior expired U. S. patent to Norton No. 762,838 dated June 14, 1904. Power is applied to rotate a shaft 52 (Fig. 1) which serves to rotate a clutch member 53. The clutch member 53 is slidably keyed relative to the shaft 52 5 and is arranged to engage either a clutch member 54 or a clutch member 55. A bevel gear 56 is formed integral with the clutch member 54 and a bevel gear 51 is formed integral with the clutch member 55. The bevel gears 53 and 51 55 together with the clutch members 54 and 55 are rotatably supported on the shaft 52. The bevel gears 56 and 5'3 mesh with a large bevel gear 58 which is supported on a transversely arranged rotatable shaft 59. The shaft 59 may be rotated in either direction by shifting the clutch member 53 either into engagement with the clutch member 55 or the clutch member 55. The shifting of the clutch member 53 is preferably accomplished by means of adjustable table dogs 56 and kit which are adjustably mounted in a T-slot 62 formed in the front edge of the table ii. A reversing lever 63 is pivotally mounted on a stud 6!; supported by an apron which is fixed to the front of the machine base. The reverse lever 53 operates through a load and fire mechanism 66 to shift the clutch member 53 automatically and in timed relation with the table movement to cause the table to traverse longitudinally in either direction.

The shaft 59 carries at its inner end a gear 67 which meshes with a gear 63 mounted on the inner end of a rotatable shaft 69. The front end of the shaft 69 carries a gear 15 which meshes with a gear 'H mounted on a shaft 79 carrying the table driving pinion 5!. It will be readily apparent that when the gear 58 is rotated in either direction, the rotation thereof will be transmitted through the shaft 59, the gear til, the gear 68, the shaft 59, the gear E8, the gear ii, and the gear 5! to move the rack 5B and the table H longitudinally relative to the base iii.

A manually operable rotatable hand traverse wheel 1-5 is provided on the front of the machine base and is rotatably supported on a shaft is. A gear ll is either formed integral with the hand wheel 75 or is fixedly mounted relative thereto. The gear H meshes with a gear 18 supported on the shaft 79. The shaft T9 in turn supports the gear H and the pinion 5! so that rotation of the manually operable traverse hand wheel 75 serves to rotate the gear 5| and transmit a longitudinal traversing movement to the rack 50 and the table H.

In order to disconnect the power mechanism when it is desired to move the table manually, a clutch member 80 is mounted on the shaft 65 and is arranged in the position of the parts illustrated in Fig. 2 to permit hand or manual traverse of the table. When it is desired to reciprocate or traverse the table manually, a manually operable lever 8! is moved about its supporting pivot 82 toward the front of the machine base to cause an endwise movement of the rod 83 toward the left, as viewed in Fig. 2, which serves to move the clutch member 8!) so as to disengage the gear 58, thus disconnecting the power mechanism from the gear H.

The headstock 2! and the footstock 22 on a large massive roll grinding machine are very heavy massive units and require considerable power to move or adjust them longitudinally relative to the table H to position them in proper position to support a work piece 29 to be ground. To attain the main object of this invention, the traversing movement of the table I l is utilized to reposition the headstock 2i and the footstock 22 in setting up the machine for a given grinding operation. A pivotally mounted arm 9b is supported on a shaft 95. The shaft 9! is supported by a pair of spaced upwardly extending arms 82 and 93 which are formed integral with a bracket 9 which is fixedly mounted on the front of the machine base it). The upper end of the arm 9d, when swung into an operative position, as illustrated in Figs. 1 and 2, lies in the path of a forwardly extending projection 95 of the headstock 25. If it is desired to move the headstock 2| toward the left on the table II, the arm 9%! is swung into the position illustrated in Figs. 1 and 2 and the headstock 2! is unclamped from the table ii. The power table traverse is then started to traverse the table H toward the right. The arm 95 serves tohold the headstock 2! in a fixed position relative to the base if! and allows the table 5 l to slide thereunder. When the headstock 2! reaches a desired position on the table, the table movement is stopped and the headstock is again clamped in adjusted position thereon. In case it is desired to move the headstock toward the right on the table H, the table l l is traversed toward the right until the arm 99 may be swung in the path of the forwardly projecting portion 96 of the headstock 2i and the table ll is then traversed toward the left until the headstock is in the desired position on the table, at which point he table movement is stopped and the headstock again clamped in its new adjusted position.

A similar arm N30 is provided for positioning the footstock 22 relative to the table II. The arm we is pivotally supported on a shaft is! carried by two spaced upwardly extending arms H12 and i which are formed integral with a bracket 36 which is fixed rigidly relative to the base l0. When the arm mil is swung toward the table II, its upper end lies in the path of a forwardly projecting portion 585 of the tailstock 22. If it is desired to move the footstock 22 toward the right relative to the table l l, the table I! is traversed toward the left. The footstock 22 is unclamped the arm 5% holds the footstock stationary relative to the base l0 and allows the table H to traverse thereunder. When the footstock is positioned in a predetermined desired position on the table ii, the table is stopped and the footstock then clamped in adjusted position. Similarly, if it is desired to move the footstock toward the left relative to the table, the arm we is swung outwardly and the table is traversed toward the left until the arm E09 can drop in position at the right of the forwardly projecting portion W5 of the footstock 22. The table H is then traversed toward the right until the footstock is properly positioned with respect to the table H, after which the footstock 22 may be locked in adjusted position. The stop arms 9% and MD may be swung downwardly against the front of the machine base when not in use. By utilizing this improved construction, the headstock 2i and the footstock 22, even though large massive units, may be readily and easily adjusted longitudinally relative to the table H without undue exertion on the part of the operator.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

1 claim 1. in a roll grinding machine having a base, a transversely movable rotatable grinding wheel, a longitudinally reciprocable work supporting table on said base, a rotatable work support including a headstock and a footstock, means to clamp said headstock and footstock in adjusted position on said table, means to traverse said table longitudinally in either direction, and means including a stop abutment on said base which is engageable with the headstock to hold the headstock stationary during a traversing movement of the table to facilitate longitudinal adjustment of the headstock relative to the table.

2. In a roll grinding machine having a base, a transversely movable rotatable grinding Wheel, a longitudinally reciprooable work supporting table on said base, a rotatable work support including a headstock and a footstock, means to clamp said headstock and footstock in adjusted position on said table, means to traverse said table longitudinally in either direction, and a pivotally mounted stop abutment on said base, said stop abutment being arranged to be swung into operative position in the path of said headstock to facilitate adjustment of the headstock relative to the table or swung to an inoperative position.

3. In a roll grinding machine having a base, a transversely movable rotatable grinding wheel, a longitudinally reciprooable work supporting table on said base, a rotatable work support including a headstock and a footstock, means to: clamp said headstock and footstock in adjusted position on said table, means to traverse said table longitudinally in either direction, and a pair of spaced stop ab-utments, one of which is located adjacent to the headstock end of the machine and is arranged to be swung into the path of the headstock to facilitate longitudinal adjustment of the headstock, and the other of which is located adjacent to the footstock end of the machine and is arranged to be swung into the path of the footstock during a traversing movement of the table to facilitate longitudinal adjustment of the footstock.

4. In a grinding machine having a. base, a longitudinally traversable work table thereon, a rotatable work support including a headstock and a footstock on said table, said headstock and footstock having surfaces mating with the upper surface of said table, a clamping device on said headstock and footstock to clamp them in adjusted position on the table, power operated means to traverse said table in either direction, and a movable stop abutment on said base which is engageable with said headstock and/or footstock during a traversing movement of the table to facilitate longitudinal adjustment of the headstock and/or footstock.

CARL G. FLYGARE. 

